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FIZIKA B 9 (2000) 4, 181-196
 
THE EXTENDED CHIRAL QUARK MODEL IN A TAMM-DANCOFF INSPIRED
APPROXIMATION
DUBRAVKO HORVATa, DAVOR HORVATIĈb, BORIS PODOBNIKb
and DUBRAVKO TADIĈb
aDepartment of Physics, Faculty of Electrical
Engineering, University of Zagreb,
HR-10000 Zagreb, Croatia
E-mail: dubravko.horvat@fer.hr
bDepartment of Physics, Faculty of Natural Sciences,
University of Zagreb,
HR-10000 Zagreb, Croatia
Received 9 June 2000; revised manuscript received 7 December
2000
Accepted 11 December 2000
A procedure inspired by the Tamm-Dancoff method is applied to the chiral quark model
which has been extended to include additional degrees of freedom: a pseudoscalar isoscalar
field as well as a triplet of scalar isovector fields. The simpler, generic s-model has been used before as a test for the Tamm-Dancoff inspired
approximation (TDIA). The extended chiral quark model is employed here to investigate
possible novel effects of the additional degrees of freedom as well as to point out the
necessesity to introduce a SU(3) flavour. Model predictions for the axial-vector coupling
constant and for the nucleon magnetic moment obtained in TDIA are compared with
experimental values.
PACS numbers: 87.15.Rn, 87.50.-a
UDC 535.217, 539.21
Keywords: extended chiral quark model, pseudoscalar isoscalar field, triplet of scalar
isovector fields, Tamm-Dancoff approximation, SU(3) flavour, axial-vector coupling
constant, nucleon magnetic moment
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